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Method, device, and system for transmitting signals in unlicensed band

a technology of unlicensed band and transmission method, applied in the direction of transmission path division, transmission monitoring, spectral gap assessment, etc., can solve the problems of difficult to guarantee communication quality, unlicensed band may occur, difficult to cope with data usage, etc., to achieve efficient transmission/receiving and efficient transmission/receiving of signals

Active Publication Date: 2019-09-10
BEIJING XIAOMI MOBILE SOFTWARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach enables efficient signal transmission and reception in cellular wireless communication systems, particularly in unlicensed bands, by minimizing interference and ensuring reliable Channel State Information measurements, thereby improving communication quality.

Problems solved by technology

In recent years, with an explosive increase of mobile traffic due to the spread of smart devices, it has been difficult to cope with data usage which increases for providing a cellular communication service only by a conventional licensed frequency spectrum or LTE-licensed frequency band.
However, unlike the licensed band in which a communication service provider secures an exclusive frequency use right through a procedure such as auction, or the like, in the unlicensed band, multiple communication facilities can be used simultaneously without limit when only a predetermined level of adjacent band protection regulation is observed.
As a result, when the unlicensed band is used in the cellular communication service, it is difficult to guarantee communication quality at a level provided in the licensed band and an interference problem with a conventional wireless communication device (e.g., wireless LAN device) using the unlicensed band may occur.

Method used

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  • Method, device, and system for transmitting signals in unlicensed band
  • Method, device, and system for transmitting signals in unlicensed band
  • Method, device, and system for transmitting signals in unlicensed band

Examples

Experimental program
Comparison scheme
Effect test

case 1

[0175) if CSI-RS is Configured in DRS in Unlicensed Band Cell

[0176]When CSI-RS is configured in DRS, the configuration of CSI-RS that configures DRS is CSI-RS configuration using OFDM symbol index #9 / #10 (SF reference). Therefore, the CSI-RS configuration within the DMTC in the unlicensed band cell may be set to only the CSI-RS configuration allocated to the OFDM symbol #9 / #10. Meanwhile, CSI-RS (DRS) and CSI-RS (CSI-RS / CSI-IM) are configured independently. Also, even if the DRS transmission is moved to the SF other than the SF #0 / #5 due to the LBT, in order to enable CSI-RS / CSI-IM measurements, the base station may set the CSI-RS / CSI-IM configuration, MeasCSI-RS-Config which is the RRC parameter, to one of resourceConfig {1, 2, 3, 6, 7, 8, 12, 13, 14, 15, 16, 17} except for resourceConfig {0, 4, 5, 9, 10, 11, 18, 19} or one in a subset of resourceConfig {1, 2, 3, 6, 7, 8, 12, 13, 14, 15, 16, 17}, like the CSI-RS (DRS) configuration. A value of the CSI-RS configuration refers to Tab...

case 2

[0214) if CSI-RS Configured for DRS is not Configured in Unlicensed Band Cell

[0215]When the CSI-RS configuration is not configured in the DRS, the OFDM symbol index #9 / #10 for the CSI-RS configured for the DRS is not used. Therefore, the CSI-RS configuration within the DMTC in the unlicensed band cell may be configured only as the CSI-RS configuration using the OFDM symbol #9 / #10. In this case, in addition to the CSI-RS / CSI-IM measurement, the DRS function may be additionally obtained by detecting the CSI-RS transmitted in the OFDM symbol index #9 / #10. The CSI-RS configured for DRS and the CSI-RS / CSI-IM configured for CSI measurement are configured independently. Accordingly, in order to enable CSI-RS / CSI-IM measurements even when DRS transmissions are moved to SFs other than SF #0 / #5 due to LBT, the base station may configure the CSI-RS / CSI-IM configuration and the CSI-RS (DRS) configuration identically. Specifically, in the unlicensed band cell, the CSI-RS configuration, the MeasC...

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Abstract

A method, device, and system for receiving a downlink signal is provided. The method includes: detecting a Channel State Information Reference Signal (CSI-RS) in a time unit #n on an unlicensed band cell; verifying whether the CSI-RS is used for Discovery RS (DRS) using an initialization value of a CSI-RS sequence of the CSI-RS; and performing a Radio Resource Management (RRM) measurement when the CSI-RS is used for the DRS. The CSI-RS is used for the DRS when an index of the time unit #n is not used for the initialization value of the CSI-RS sequence.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of International Patent Application No. PCT / KR2016 / 012755 filed on Nov. 7, 2016, which claims the priority to Korean Patent Application No. 10-2015-0155267 filed in the Korean Intellectual Property Office on Nov. 5, 2015, and Korean Patent Application No. 10-2015-0159842 filed in the Korean Intellectual Property Office on Nov. 13, 2015, the entire contents of which are incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates to a wireless communication system. Specifically, the present invention relates to a method, device, and system for performing transmission or reception of a signal in an unlicensed band.BACKGROUND ART[0003]In recent years, with an explosive increase of mobile traffic due to the spread of smart devices, it has been difficult to cope with data usage which increases for providing a cellular communication service only by a conventional licensed frequency spect...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04L27/26H04L5/00H04W16/14H04L27/00H04W84/04H04W74/08H04W24/08
CPCH04W16/14H04L5/005H04L5/0051H04L5/0053H04L27/261H04L27/0006H04W84/042H04L5/001H04W24/08H04W74/0808H04L5/0007H04L27/2659H04L27/2613H04L27/2607H04B17/309
Inventor NOH, MINSEOKKWAK, JINSAMSON, JUHYUNG
Owner BEIJING XIAOMI MOBILE SOFTWARE CO LTD
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